Cited 6 times since 2006 (0.3 per year) source: EuropePMC Journal of endovascular therapy : an official journal of the International Society of Endovascular Specialists, Volume 13, Issue 4, 1 1 2006, Pages 468-475 Roentgen stereophotogrammetric analysis: an accurate tool to assess stent-graft migration. Koning OH, Oudegeest OR, Valstar ER, Garling EH, van der Linden E, Hinnen JW, Hamming JF, Vossepoel AM, van Bockel JH
Purpose
To evaluate in an in vitro model the feasibility and accuracy of Roentgen stereophotogrammetric analysis (RSA) versus computed tomography (CT) for the ability to detect stent-graft migration.
Methods
An aortic model was constructed from a 22-mm-diameter Plexiglas tube with 6-mm polytetrafluoroethylene inlays to mimic the renal arteries. Six tantalum markers were placed in the wall of the aortic tube proximal to the renal arteries. Another 6 markers were added to a Gianturco stent, which was cast in Plexiglas and placed inside the aorta and fixed to a micromanipulator to precisely control displacement of the stent along the longitudinal axis. Sixteen migrations were analyzed with RSA software and compared to the micromanipulator. Thirty-two migrations were measured by 3 observers from CT images acquired with 16x0.5-mm beam collimation and reconstructed with a 0.5-mm slice thickness and a 0.4-mm reconstruction interval. Measurements were made with Vitrea postprocessing software using a standard clinical protocol and central lumen line reconstruction. Results of CT were also compared to the micromanipulator.
Results
The mean RSA measurement error compared to the micromanipulator was 0.002+/-0.044 mm, and the maximum error was 0.10 mm. There was no statistically significant interobserver variability for CT (p=0.17). The pooled mean (maximum) measurement error of CT was 0.14+/-0.29 (1.00) mm, which was significantly different from the RSA measurement error (p<0.0001).
Conclusion
Detection of endograft migration by RSA is feasible and was significantly more accurate than CT in this nonpulsatile in vitro model.
